Shaggy HideThe bestial hero is titanic in size and may use a double-handed weapon in one hand.

Then on the corrections and erratas of EIF says:

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Page 74, Shaggy Hide skillReplace the existing definition with the following:ďThe Beastmanís massively shaggy hide acts as armour, deflecting sword strokes and protecting him from harm. The model gains a 6+ Armour Save that can be combined with other armour as normal.Ē

And on the Ultimate FAQ from Mordheimer says:

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Q: Skill Massive Strength. A Beastman Hero is titanic in size and may use a double-handed weapon in one hand. Now, read literally, the means ONLY Double-Handed Weapons (+2 Str, Strike Last) can be used one-handed. But, is it intended that other two-hand weapons (Halberd, Flail, etc) can be used One-handed with this skill?A: No, those weapons rely more on skill. This skill simply represents the brutish strength of the said Beastman. [Tuomas, E-groups Mordheim mail list]

So... Does this FAQ suggest that there is a skill called Massive Strength that was forgotten in EIF or did that skill disappear?

For the official rules always refer to the Rulebook (which is updates and downloadable from the GW site) and the Empire in Flames book (which has not been updated) and apply the corrections from the Rules Review. Everything else is likely to be out of date (like the Mordheimer stuff in this case). The Rules Review, EIF, Annual and Rulebook are the most current sources.